The elastic scattering of alpha particles from ${\mathrm{C}}^{12}$ has been used to measure the spins, parities, and widths of two previously unassigned states of ${\mathrm{O}}^{16}$. These levels at excitation energies of 11.094±0.006 and 12.050±0.008 MeV were found to have $J^{\pi }=4^{+} \mathrm{and} 0^{+}$, respectively, and center-of-mass widths of 0.3±0.1 and 1.5±0.5 keV, corresponding to values of the dimensionless reduced width $\theta _{\alpha }^{}{}_{}{}^2={10}^{-3\mathrm{}} \mathrm{and} 4\times {10}^{-4\mathrm{}}$.

• Received 21 February 1966

DOI:https://doi.org/10.1103/PhysRev.147.760